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European Euphorbia Questions

HiYa, Greetings from Germany.
We are looking for an expert advice and hope you might be able to help. Our Euphorbia has on the bottom of the main stem a blackish discoloration. It is not soft or in anyway different texture from the rest of the cacti 🌵. We just worried it is some kind of rot. Do you know how best to proceed? Leave it for now or cut it and replant?

Kind regards

Mel

It looks like the start of rot. The soil looks too rich for the Euphorbia, so it may be taking too long to dry out after watering. You can use a systemic fungicide now and wait to see if it gets worse, or you can take the cuttings now to be sure. I recommend cutting just above the first branch, and taking that branch as a separate cutting. Spray with Hydrogen peroxide to help the ends heal, dust with Sulfur Dust. Wait a week and then plant into new fresh fast draining cactus soil. Be careful with the milky white latex sap as it is caustic and you do not want it near your eyes or lips.